CYLINDER HEAD OF MULTI-CYLINDER ENGINE

• Main Authors: YAMAZAKI MAKOTO, OTA ATSUSHI, TAKEGATA NORIYUKI, ITO HIROAKI, SHIBATA KAZUO
• Format: Patent
• Language: English; Japanese
• Published: 27.09.2021
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

To provide a cylinder head capable of suppressing local overheating around an exhaust outlet and reducing an exhaust temperature.SOLUTION: A cylinder head 3 has an exhaust passage 51 that is provided for each cylinder 1 and extends from a corresponding combustion chamber 6 in a direction intersecting a cylinder row direction, an exhaust collection part 52 commonly connected to a plurality of exhaust passages 51, and a water jacket (30) formed adjacently to the exhaust collection part 52, and on an inner peripheral surface 43i of the exhaust collection part 52, an annular uneven part (60) extending along the circumferential direction is formed. The uneven part comprises an annular ridge 60 projecting from the inner peripheral surface 43i of the exhaust collection part 52. The exhaust whose flow velocity is increased at the ridge 60 in which an exhaust flow path is narrowed actively transfers heat to the ridge 60, and an exhaust temperature is reduced.SELECTED DRAWING: Figure 8 【課題】排気出口周りの局所的な過熱を抑制すると共に排気温度を低減可能なシリンダヘッドを提供する。【解決手段】シリンダヘッド３は、シリンダ１ごとに設けられ、対応する燃焼室６からシリンダ列方向に交差する方向へ延びる排気通路５１と、複数の排気通路５１に共通に接続された排気集合部５２と、排気集合部５２に隣接して形成されたウォータージャケット（３０）とを有し、排気集合部５２の内周面４３ｉに、周方向に沿って延在する環状の凹凸部（６０）が形成される。凹凸部は排気集合部５２の内周面４３ｉから突出する環状の突条６０を含む。排気流路が絞られた突条６０にて流速を増大させた排気が突条６０に対して活発に熱伝達を行い、排気温度が低減する。【選択図】図８